Composition and method for promoting adhesion of thermoplastic elastomers to metal substrates
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United States of America Patent
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Dec 24, 2002
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app pub date -
Oct 28, 1996
filing date -
May 26, 1993
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Abstract
Adhesion of shaped thermoplastic elastomer articles is promoted without the need for special primers or other supplemental resin additives by incorporating in an enamel coating composition, an adhesion promoting amount of a carboxyl-modified poly (alpha-olefin) polymer resin. In accordance with a preferred embodiment, the enamel coating composition is a corrosion-resistant cresol-formaldehyde/epoxy resin coating containing from about 0.1% to about 3% by weight of a maleic anhydride-modified polypropylene resin adhesion promoter. The compositions and bonding methods described are useful to provide bonded structures of shaped thermoplastic elastomers, such as SEBS, PBR and EPDM copolymers, heat sealed to metallic substrates, especially metal closures for food containers destined for exposure to high temperature filling, sterilization and retort processing conditions.
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